Table of Contents
Advertisement
Figure 25. Arrangement for rupture disk relief piping
Outside
wall
Support
this pipe
Flexible
steel
connection
(length as required
for easy access)
I I m m p p o o r r t t a a n n t t : : On the purge discharge vent line, the purge
exhaust connection point MUST be lower
than the purge height. Do NOT create a U-
trap; extend to drip leg if necessary to
avoid a trap.
N N o o t t e e : : The drip leg is REQUIRED. The drip leg should be
a minimum of 1 gal (3.8 L) capacity and must be
drained periodically for proper chiller purge
operation.
N N o o t t e e s s : :
•
If a RuptureGuard™ is to be installed,
remove and discard the factory-installed
rupture disk; for more information, refer to
Installation, Operation, and Maintenance:
RuptureGuard Pressure Relief System
Option (CTV-SVX06*-EN).
•
The rated flow capacity of the
RuptureGuard™ disk/valve assembly is
based on having straight pipe extending
past the spring mechanism downstream of
the valve. Be sure there are no crosses (a
derate on the rated flow capacity for this
configuration is published in Engineering
Bulletin: RuptureGuard Selection Guide [E/
CTV-EB-10]), elbows, tees or any other
obstructions within the first 9 in. (228.6 mm)
of valve discharge. Refer to ASHRAE
Standard 15 for additional requirements on
piping rupture disk and relief valve vent
lines.
CDHF-SVX01N-EN
Alternate
Purge discharge
vent line
Rupture disk
assembly
Drip leg
1/4 in. FL x 1/4 in. NPT
drain valve
Figure 26. RuptureGuard external vent line and drip
leg (not provided)
Metal
exhaust
RuptureGuard
disk
Chiller
flange
Drain
line
Important: The purge exhaust line MUST be connected to the
downstream side piping to vent purge exhaust out the vent line
to the outdoors; it may need to be extended to the drip leg.
Field-acquired tubing may be required to extend to the
field-supplied vent piping, depending on distance. Do NOT
create a U-trap in the purge exhaust line; this line MUST be
sloped from purge (highest point toward field-supplied piping,
lower point toward connection) to allow proper draining of any
condensation.
N N o o t t e e s s : :
•
Use Loctite® 242 or Loctite® 277 on all
threaded joints on chillers charged with
refrigerant; use of other pipe thread sealants
is NOT recommended. Ensure all threaded
pipe joints are properly cleaned and
prepared before assembly. An alternative to
the use of Loctite® is to thread and weld the
inlet adapter to the pipe. Care must be taken
to ensure that the flange mating surface
remains flat. Do NOT weld on the Inlet
Adapter flange while connected to the
RuptureGuard™.
•
The drip leg is REQUIRED. The drip leg
should be a minimum of 1 gal (3.8 L)
capacity and must be drained periodically
for proper chiller purge operation.
I I m m p p o o r r t t a a n n t t : : If a RuptureGuard™ is to be installed, it
MUST be installed properly. Failure to
properly install RuptureGuard™ will likely
result in a start-up delays and required
rework and expenses that result from a
failure to properly install RuptureGuard™
will NOT be paid by Trane.
V V e e n n t t P P i i p p i i n n g g
Purge
Vent to
outdoors
Flange
Flange
Drain
valve
Drip
leg
37
Advertisement
Table of Contents
